.burger {
  display: none;
  font-size: 30px;
  cursor: pointer;
}

/* 📱 MOBILE */
@media (max-width: 768px) {

  header {
    position: relative;
  }

  .burger {
    display: block;
  }

  /* 🔥 IMPORTANT */
  #menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 70px;
    right: 0;
    width: 220px;
    background: white;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    z-index: 1000;
  }

  #menu.active {
    display: flex;
  }

  #menu a {
    margin: 10px 0;
    display: block;
  }
}